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//Title of this code
//Rextester.Program.Main is the entry point for your code. Don't change it.

using System;
using System.Collections.Generic;
using System.Linq;
using System.Text.RegularExpressions;

namespace Rextester
{
    public class Program
    {
        public static void Main(string[] args)
        {
            var list1 = new List<Project>(){
                new Project{ProjectId=1,ProjectName="A"},  
                new Project{ProjectId=2,ProjectName="B"},
            };
                
            var list2 = new List<Project>(){
                new Project{ProjectId=1,Customer="C1"},  
                new Project{ProjectId=2,Customer="C2"},
            };
                
            var list3 = new List<Project>(){
                new Project{ProjectId=1,Address="A1"},  
                new Project{ProjectId=2,Address="A2"},
            };
                
                
            var merged = list1.MergeWith(list2, i => i.ProjectId,(lhs,rhs) => new Project{ProjectId=lhs.ProjectId,ProjectName=lhs.ProjectName, Customer=rhs.Customer}).MergeWith(list3,i => i.ProjectId, (lhs,rhs) => new Project{ProjectId=lhs.ProjectId,ProjectName=lhs.ProjectName, Customer=lhs.Customer,Address=rhs.Address});
            foreach(var item in merged)
            {
                Console.WriteLine("ProjectId={0}, ProjectName={1}, Customer={2}, Address={3}",item.ProjectId,item.ProjectName,item.Customer,item.Address);
            }
        }
        
       
    }
    
    public static class Extensions
    {
        public static List<T> MergeWith<T,TKey>(this List<T> list, List<T> other, Func<T,TKey> keySelector, Func<T,T,T> merge)
        {
            var newList = new List<T>();
            foreach(var item in list)
            {
                var otherItem = other.SingleOrDefault((i) => keySelector(i).Equals(keySelector(item)));
                if(otherItem != null)
                {
                    newList.Add(merge(item,otherItem));
                }
            }
            return newList;
        }
    }
    
    public class Project 
    {   public int ProjectId { get; set; }
        public string ProjectName { get; set; }
        public string Customer { get; set; }
        public string Address{ get; set; }
    }

}

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Compilation time: 0.67 sec, absolute running time: 0.16 sec, cpu time: 0.14 sec, average memory usage: 16 Mb, average nr of threads: 3